Biology – 2.2 Size of specimens | e-Consult
2.2 Size of specimens (1 questions)
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Total magnification = Eyepiece magnification x Objective magnification
Total magnification = 10mm x 40 = 400x
Size of object in the specimen = (Size observed in the specimen) / (Magnification)
Apparent length of bacterium in the specimen = 25 micrometres / 400 = 0.0625 micrometres
Convert micrometres to millimetres: 0.0625 micrometres x (1mm / 1000 micrometres) = 0.0000625mm
Therefore, the total magnification is 400x and the apparent length of the bacterium is 0.0000625mm.